哪位哥哥姐姐帮我翻译一下下面的摘要呗！谢谢

Prestressed concrete box girder with its structural rigidity for good, smooth driving comfort, appearance handsome, conservation and has the advantages of simple engineering welcome. The current span of 40 ~ 100 m bridge, continuous prestressed concrete box-girder bridge has become one of the main bridge. This article by Yu Jiang Elm Road to Germany of 20 days +30 * 2 +20 Span of prestressed concrete box-girder bridge for the upper structure of the design, to understand the application software Dr. bridge, Auto CAD graphics features, bridges Dr. and Auto CAD and interactive bridge design process. In describing the main bridge Dr. modeling process, and in accordance with the construction phase to explain. During the construction of the main points of that prestressed reinforced Tension methods and prestressed pipeline laying. Papers presented in the final results of Dr bridge, the relevant icon and Auto CAD drawings. At the same time, in terms of software and some of the parameters to be used to identify the formula. Papers related to the design follow the norms.